/Engine/Source/Runtime/Experimental/GeometryCollectionEngine/Public/GeometryCollection/GeometryCollectionEngineConversion.h
Appends a GeometryCollectionSource to a GeometryCollection
static void AppendGeometryCollectionSource ( const [FGeometryCollectionSource](API\Runtime\GeometryCollectionEngine\GeometryCollection\FGeometryCollectionSource) & GeometryCollectionSource, [FGeometryCollection](API\Runtime\Chaos\GeometryCollection\FGeometryCollection) & GeometryCollectionInOut, [TArray](API\Runtime\Core\Containers\TArray)< [UMaterial](API\Runtime\Engine\Materials\UMaterial) * > & MaterialsInOut, bool ReindexMaterials )